Despite significant progress, Beijing's mayor says his city's battle against #airpollution will be "extremely difficult." Beijing has cut #PM25 to 58 mg per cubic meter, still well above the @WHO-accepted level of 10 mg. @EPIC_India #AQLI (via @Reuters):https://www.reuters.com/article/us-china-pollution-beijing/beijings-struggle-against-pollution-will-be-tough-take-time-mayor-idUSKBN1FD0EJ?mc_cid=8b811dcdcd&mc_eid=506f02c4af …
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